Overview

Transcendental Meditation (TM) is an effective meditation technique introduced to the West by Maharishi Mahesh Yogi, which became popular in the 1970s due to its scientifically proven benefits on individual well-being. This practice does not require specific rules, such as rigid postures, controlled breathing, or intense concentration, being very simple and effortlessly accessible to practice anytime and anywhere. Moreover, its mechanism is based on the repetition of a mantra to reduce thoughts and achieve a higher state of consciousness, leading to a sense of extreme mental and physical relaxation. As a result, TM has been associated with the ability to reach a “fourth state of consciousness” beyond wakefulness, sleep, and dreaming, thus creating a transcendental connection. 

Several studies have shown that TM has positive effects on the autonomic nervous, endocrine, neurological, and cardiovascular systems. It was mainly studied and then introduced because of its reduction effect on anxiety and stress, enhancing creativity, concentration, and emotional stability. Furthermore, lowering cortisol and norepinephrine (stress hormones), and increasing serotonin and dopamine (happiness hormones).¹

Repeating the mantra twice a day for at least 15 to 20 minutes can significantly improve quality of life, especially for people who experience chronic high stress. However, even though its biological mechanism is not yet fully understood, TM can alter neural patterns in some way.²

Stress and its impact

Stress is a physiological and psychological response to external or internal factors, being an important contributing factor to tense situations, anxiety, and depression. It can be distinguished into three categories:³

• Positive stress: occurs after minor challenges, being essential for survival sometimes, but still can be managed with guided support
• Tolerable stress: more intense but moderate, which can be overcome with proper care
• Toxic stress: results from prolonged episodes of severe stress, becoming chronic and significantly interfering with the body’s stress response system

Stress response is strictly regulated by the organism to maintain body homeostasis. While acute stress can be adaptive, chronic stress can exacerbate health problems, causing serious consequences like continuously activating the nervous, immune, digestive, and cardiovascular systems. This leads to an overproduction of glucocorticoids, resulting in depression, abdominal obesity, osteoporosis, and cardiovascular issues. 

Nervous system

In addition to leading to the well-known consequences, such as anxiety and depression, stress can also significantly affect other neuronal functions, sometimes even more severely, impairing proper mental processes. It impacts memory by shrinking hippocampal neurons and altering neurotransmitter activity. 

Moreover, high levels of cortisol and catecholamines due to chronic stress interfere with memory consolidation, affect cognition, such as learning, by altering hippocampal and amygdala function. In some cases, stress can also impact protein production, contributing to neurodegenerative diseases like progressive cerebello-cerebral atrophy (PCCA) and Alzheimer’s.

Immune and endocrine systems

Stress affects both the immune and endocrine systems by regulating white blood cells and hormonal release. Nevertheless, when stress levels are elevated, it can result in a decline in immune function, raising the likelihood of infections, as well as interfering with hormone production, which can lead to decreased testosterone levels and potential fertility problems. In serious cases, it can lead to the development and progression of cancer.

Cardiovascular system

Psychological stress is one of the most studied risk factors for cardiovascular diseases. Its negative effects are initially seen in an accelerated heart rate and higher blood pressure, followed by clotting, high blood lipids, and vascular changes, all of which contribute to heart arrhythmias and myocardial infarction (MI). Furthermore, chronic stress has been scientifically proven to raise cortisol levels, cholesterol, and triglycerides, promoting atherosclerosis, heart attacks and strokes. 

Enteric system

Another component influenced by stress is the enteric nervous system, known as the brain of the gut, which can experience digestive issues, functional dyspepsia, peptic ulcers, and irritable bowel disease (IBD), all of which can be worsened by stress. 

Overall, stress impacts various biological systems and significantly compromises an individual's quality of life, which includes physical, psychological, and social aspects.³

The Mechanisms of Transcendental Meditation

TM’s unique approach compared to other meditation techniques

Transcendental meditation differs from other meditation forms. Mindfulness or concentrative meditation, for example, which requires absolute concentration or monitoring thoughts, but TM is just a natural auto-transcendence through the mantra. Its benefits have shown a greater impact on various neurological and psychological aspects, including effective stress reduction and improved quality of life.^1,2

Physiological effects of TM on the nervous system

TM has significant effects on the nervous system by activating the parasympathetic nervous system response. It induces a state of “restful alertness” characterised by a slowing of both heartbeat and breathing. As a result, there is a marked reduction in cortisol levels and other stress-related hormones, promoting immediate relaxation and a sense of inner peace.^1,2,4 

Neurological impact of TM 

Neurologically, TM leads to modifications in brain activity by enhancing the coherence and synchrony of electroencephalography (EEG) alpha waves, particularly in the prefrontal and temporal regions, which are critical for functions like attention, emotional regulation, and decision-making. 

Furthermore, significant activation occurs in the prefrontal cortex and anterior cingulate gyrus, accompanied by alterations in blood flow within the prefrontal cortex after practising TM. This leads to improved neurochemical balance, with increased release of neurotransmitters, such as Gamma-Aminobutyric Acid (GABA), glutamate, and dopamine, which support the regulation of both mood and motivation.^1,2,4

Psychological mechanisms

Psychologically, TM induces a silent and natural state of awareness. This technique differs from others, as it strengthens emotional regulation, resilience, and cognitive functioning. Memory and verbal processing appear to be significantly improved after practising TM. Therefore, these changes are indicative of a neuroprotective effect and improved mental health.^1,2

Evidence of TM’s effectiveness in stress reduction

Several studies have demonstrated the effectiveness of TM in reducing stress and improving psychological well-being. For instance, a recent study conducted among women living in conditions of extreme poverty, violence, and limited access to mental health services in Uganda introduced TM as a tool to promote inner empowerment. Participants practised TM twice a day, and after 5 months, they obtained impressive benefits in self-esteem, self-efficacy, gratitude, hope, and resilience. After 8 months, they also manifested positive outcomes in stress and fatigue, physical health, and social relationships, highlighting how this meditation method is both sustainable and effective for reducing long-term stress.²

Practical application

To understand how to practice TM, it is required to be guided by a certified instructor who provides step-by-step instructions on how to engage with this method of meditation. Subsequently, it is not difficult to effectively apply it, as it simply includes getting comfy, closing the eyes and starting to “think” of a personalised mantra, which can be a nonsense word or sound, and repeating it. However, the goal is not to keep the focus on the mantra. Instead, it helps the mind naturally settle into a quiet and peaceful state. Regarding thoughts, they are not completely suppressed, as they may come and go, and that’s a normal part of the process. So, TM is not about trying to deeply control the mind, but effortlessly going beyond active thinking, allowing self-awareness and inner calm to emerge.^2,5

Summary

Transcendental meditation (TM) is a natural and approachable meditation technique that helps calm the mind and reach a state of deep relaxation by simply repeating a personal mantra. This method differs from others as it does not require intense concentration, specific body positions, or any real effort. Several studies have shown that TM reduces stress by lowering stress hormones like cortisol and norepinephrine, while at the same time boosting positive chemicals, such as serotonin and dopamine. It is recommended to practice TM for 15-20 minutes twice a day to see noticeable improvements in mental health. Studies demonstrated that many people reported better emotional balance, stronger memory, greater resilience, and an overall better quality of life in just a few months after practising it consistently.

This meditation technique is significantly helpful in managing chronic stress, which is known to be critical in determining several pathologies, from psychological to immune and cardiac ones. Therefore, by just repeating the mantra, it is possible to settle into a restful and peaceful mode, thus regulating the parasympathetic response, while also supporting healthy brain function in areas tied to emotions and decision-making. Future research should aim to investigate how TM works on a biological level and how it impacts different groups of people over time. Moreover, since it is easy and affordable, it has the potential to be considered a powerful tool for improving mental and physical health and be introduced especially in high-stress communities where healthcare structures and education are limited.